HP ProLiant SL390s G7 1U Half-width Server Maintenance and Service Guide

Diagnostic tools 73
USB support and functionality
USB support
HP provides both standard USB 2.0 support and legacy USB 2.0 support. Standard support is
provided by the OS through the appropriate USB device drivers. Before the OS loads, HP provides
support for USB devices through legacy USB support, which is enabled by default in the system ROM.
Legacy USB support provides USB functionality in environments where USB support is not available
normally. Specifically, HP provides legacy USB functionality for the following:
• POST
• RBSU
• Diagnostics
• DOS
• Operating environments which do not provide native USB support
Internal USB functionality
An internal USB connector is available for use with security key devices and USB drive keys. This
solution provides for use of a permanent USB key installed in the internal connector, avoiding issues
of clearance on the front of the rack and physical access to secure data.
For additional security, external USB functionality can be disabled through RBSU. Disabling external
USB support in RBSU disables the USB connectors on the local I/O cable. Internal USB functionality is
unaffected.
Internal SD support
An internal SD connector is available for use with embedded Hypervisors. This solution provides for
use of a permanently installed SD card in the internal connector, decreasing the possibility of
tampering or loss.